Pieter Claesz Wyckoff, the immigrant ancestor of the Wyckoff family, came from the Netherlands in 1636 and finally settled in Flatlands. He married Grietje, daughter of Henrick Van Ness. He cultivated the bouwery of Director Petrus Stuyvesant in Flatlands in 1655, having previously, in 1698, bought of Wolfert Gerritse Van Couwenhoven twentynine morgens in that town and in 1656 another tract of Wolfert. He was a magistrate of Flatlands in 1655-62-63, on the patents of 1667 and 1686, and a member of the Flatlands Dutch Church in 1677. Children 1. Annetje Pieterse, baptized November 27, 1650; married Roelif Martense Schenck. 2. Mayken or Maria Pieterse, baptized October 17, 1653; married Willem Willemse, of Gravesend, who immigrated in 1657 their son Peter had a son Johannes Williamson, who took the name of Wyckoff at the instance of his great uncle Henrik Wyckoff, and his son John Wyckoff had a son Abram, of Gravesend, thought to be father of Abram Wyckoff, mentioned elsewhere. 3. Geertje Pieterse, married Christoffel Janse Romeyn. 4. Margrietje Pieterse, married Matthias Adamse Brouwer. 5. Claes or Nicholas Pieterse, of Flatlands. 6. Cornelis Pieterse, of New Lotts. 7. Henrick Pieterse, of Flatlands. 8. Garret Pieterse, of Flatlands. 9. Jan Pieterse, of Flatlands. 10. Willemtje Pieterse.
(I) Abram Wyckoff, descendant of Pieter Claesz Wyckoff, the progenitor of all the early colonial Wyckoffs, was one of the early settlers in Seneca county.